Toshiba Kikai Kabushiki Kaisha

Seiichi Tsuchiya

Makoto Hayashi

Mitsuhiko Iida

Kimio Suzuki

Mutsumi Naniwa

Shizunori Kaneko

A printing machine such as a rotary offset press includes a printed material monitoring apparatus comprising sensor units for detecting light reflected from a number of unit pixel domains which are divided in a direction perpendicular to a direction in which a print surface of a printed material flows, optical fiber units for transmitting light reflected from the unit pixel domains to the sensor units and a signal processing unit for processing signals transmitted from the sensor units. The sensor units comprise detection sensors each being equipped with a plurality of light reception elements corresponding to the unit pixel domains respectively. The light reception elements are arranged in a plurality of rows of a fixed amount in a direction in which the print surface of the printed material flows to form groups of fixed amount of rows in which the light reception elements are arranged. The signal processing unit comprises analog multiplexer for multiplexing analog information detected by each of the light reception elements in the groups in which the rows of the light reception elements are arranged and digital multiplexer for further digitizing and multiplexing the multiplexed analog information transmitted from each of the groups of the light reception elements.

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Gotenba, Japan

Seiichi Tsuchiya